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The Department for Energy and Climate Change does not collect data on the amount of time onshore or offshore wind turbines are operational, but a 2011 report by the Centre for Sustainable Energy found that wind farms generate electricity around 80% to 85% of the time. Wind power is converted to electricity efficiently, with none of the thermal waste inherent in fossil fuel plants(1). Wind power is a source of energy that does not produce carbon dioxide.
It should also be noted that generators are only paid for the electricity they actually generate.
(1) ‘Common concerns about windpower’ (2011), Centre for Sustainable Energy: